Improvement in sewing-machines



J. GEIERMANN Sewing Machine.

Paltenttad- June 19, 1860.

l-nuenro-r- 7 WW UNITED STATES PATENT OFFICE,

JOSEPH GEIERMANN, .OF ALBANY, NEXV YORK.

IMPROVEMENT IN SEWING MACHlNESQ Specification forming part of LettersPatent No. 28,746,1lated June 19, 1860.

To all whom it 11mg concern Be it known that I, JOSEPH GEIERMANN, of thecity of Albany, in the county of Albany and State of New" York, haveinventeda new and useful Improvement in Sewing-lVIachines; and I dohereby declare that the following is a full and exactdescriptionthereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon.

Figure I represents a longitudinal section of the machine. Fig. II showsa top view with the top plate removed, and Fig. III represents thestitch made by my improved machine.

.The nature of my invention consists in the manner of combining andoperatingtwo shuttles and one needle to make a stitch of a novelcharacter with three threads.

The toppart or table, A, of the-machine is made with a circular opening,into which a revolving plate, B,'is fitted, supported on a center, 0. Onthe upper side of this plateB pro jections a a are made to receive twoshuttles, D D, one directly opposite to the other. The outercircumference of this revolving plate B comes close to the needle E whenthe same is moved downward.

The needle-bar F, to which the needle E is attached, is worked in theusual manner by. means of the bell-crank G, operated through theeccentric cani or wheel H, fast on the shaft K.

The under side of the revolving plate B is provided with teeth a ma .r'.The teeth w a"- eiftend only one-half of the space between the outerriin,'2, on the under side of the revolving plate B and the central hub,3, while the teeth x 00 extend the whole distance. Bythis arrangementthe number of teeth n ear the outer v rim, 2, will be exactly double ofthe number of teeth near the center hub, 3. On the axis or shaft K apinion, I, is placed, having the same number of teeth as there are onthe plate B near the center hub, 3, and consequently half 'as manyteethas there are near the outer rim, 2, of said plate. I f, therefore,the pinions 1 be placed-on the shaft- K so as to gear into the teethnear the outer rim, 2, the plate B will be made to revolve only oncewhile the 1 the cloth to be sewed, and a loop has been formed,- theshuttle D passes through said loop, when the needle is moved upward andl the thread tightened. The needle moves then again downward through thecloth, when a second loop will be formed, through which the othershuttle, D, passes, as during this time the revolving plate B, as abovedescribed, has only made one-half of arevolution. This third time theneedle comes through the cloth and the loop has been formed, the shuttleD will be again in a position to pass through said loop, and the shuttleD will pass again through the fourth loop, each shuttle passing in thismanner alternately through every second loop, and forming therebya noveland very strong stitch, as represented in an enlarged size in Fig. III.

For light work, when the common stitch will be strong enough, oneshuttle'may'be taken away, and the pinion I moved on the shaft K (in theposition represented in Fig. I

in dotted lines, and marked P) so as to gear into the teeth It only,which, as above de scribed, being near the hub 3, causes the plate B torevolve as fast as the shaft K, and consequently the one shuttle willalways be in a I position to pass through every loop as soon as formed,and producing thereby the common stitch.

I do not claim providing radiating teeth or cogs on the under side ofthe shuttle-plate B, arranged with a shifting pinion for combinedoperation; but

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination of two shuttles and one needle, operating together so asto form with three threads a stitch, substantially as described, andinthe mariner specified.

JOSEPH GE'IERMANN.

Vitnessesr JACOB HANS, Jos. LUEKE.

